Re: Blocking port 25 outbound

[Michael Grinnell <grinnell () AMERICAN EDU>]

We have.  Keep in mind it's not a panacea, but it does help with the  
outbound spam volume.  Make sure you publicize it a lot before doing  
so.  Once you do this, you still need to check who's sending large  
volumes of mail through your mailserver, as some spam bots are smart  
enough to find it and use it.  Also, it helps to set up SMTP AUTH  
first.  That way, your users can set their email programs to always  
use your outbound mail server, and they won't have to keep changing  
their outbound mail server when they move on and off campus.

Michael Grinnell
Network Security Administrator
The American University
e-mail: grinnell () american edu

On Aug 22, 2005, at 3:29 PM, Lazor, Joseph wrote:

> Hello out there,
>
>
>
> We are considering blocking all port 25 traffic outbound.  We have  
> noted various ISP’s and others moving to block port 25 outbound to  
> reduce “spamming”.  We wish to be good “netizens”
>
> Have any of you done this already and what has been the push back  
> of issues related to implementation on your campus?
>
>
>
> Regards,
>
>
>
> Joseph A. Lazor
>
> Florida Sate University